A National Transportation Safety Board report released Tuesday shed more light on a crash involving an Arizona Department of Public Safety helicopter in Flagstaff that left two DPS crew members dead.

Trooper-paramedic Hunter Bennett and pilot Robert Skankey died when their helicopter crashed during active shooter pursuit in Flagstaff last month.

A mechanical failure, specifically a problem with the main rotor, caused the fatal DPS helicopter crash in Flagstaff, according to a preliminary NTSB report.

The preliminary NTSB reports reveals more details about the deadly helicopter crash reported last month in Flagstaff.

A preliminary report points to a significant mechanical problem before a deadly police helicopter crash that happened during a shootout in Flagstaff, Arizona.